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• W2048260086 abstract "PURPOSE: It is well known that the completion of prior cycle exercise results in a decrease in subsequent running economy. While the mechanisms responsible have not been established, it is possible that this is related to a depletion of glycogen stores, particularly in the type I fibres. We tested the hypothesis that, compared to a constant-intensity cycle, a variable-intensity cycle would result in glycogen sparing within type I fibres and a smaller decrease in subsequent running economy. METHODS: In a random order, nine well-trained, male triathletes completed 60 min of cycling at a constant power output (CON) or variable power output (VAR). Muscle biopsies (vastus lateralis) were performed prior to and immediately following each of these two tests. These two tests, without biopsies, were replicated, in a random order, within two weeks with the addition of a treadmill run immediately following the cycle to determine running economy. RESULTS: No differences were observed for VO2, HR or plasma [La-] values between the running sessions of VAR and CON. During CON cycling, there was a significantly greater glycogen depletion in the type I fibers compared to type II (0.077 ± 0.044 vs. 0.018 ± 0.010 OD; P<0.05), while during the VAR condition there was a significantly greater glycogen depletion in the type II fibers compared to type I (0.064 ± 0.032 vs. 0.031 ± 0.026 OD; P<0.05). The variation in muscle glycogen depletion patterns was not associated with the detriment in subsequent running economy. There was a strong correlation between the total muscle glycogen depletion and the change in running VO2 (r = 0.76; P<0.05) when the data from both trials were combined. There was a negative correlation between the percentage of type I muscle fibers and glycogen depletion within type II fibers during the constant cycling condition (r = −0.85, P<0.05). CONCLUSIONS: The results of this study demonstrate that running economy, subsequent to 60 min of cycling, is not affected by the cycling strategy employed. While different glycogen depletion patterns were observed between the two conditions, total glycogen depletion may be more important to subsequent running economy. The percentage of type I fibers may influence the glycogen depletion pattern during constant-load, but not variable-intensity exercise." @default.
• W2048260086 created "2016-06-24" @default.
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• W2048260086 date "2007-05-01" @default.
• W2048260086 modified "2023-10-18" @default.
• W2048260086 title "Effects of Variable and Constant Cycle Power on Glycogen Depletion Patterns and Subsequent Running Economy" @default.
• W2048260086 doi "https://doi.org/10.1249/01.mss.0000274611.39786.5a" @default.
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